کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1819386 | 1525761 | 2009 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Flux mapping at 77Â K and local measurement at lower temperature of thin-wall YBaCuO single-domain samples oxygenated under high pressure
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
YBCO single-domain samples are suitable for the production of high trapped fields in the range 20-77Â K using a cryocooler or liquid nitrogen. But the oxygenation process required to actually transform the single domains into superconductors induces an extensive crack network that is limiting the material performances. Thin-wall geometry has been introduced to reduce the diffusion paths and to enable a progressive oxygenation strategy. As a consequence cracks are drastically reduced. In addition the use of a high oxygen pressure (16Â MPa) speeds up further the process by displacing the oxygen-temperature equilibrium towards the higher temperature of the phase diagram. The advantage of thin-wall geometry is that such an annealing can be applied directly to a much larger sample. Remarkable results are obtained without any doping by the combination of thin walls and oxygen high pressure. While classical plain samples yield 300-400Â mT, a trapped field of 840Â mT has been measured at 77Â K on a 16Â mm diameter Y123 thin-wall single-domain sample with an annealing time as short as 3Â days. Local measurements with a fixed Hall probe on top of the sample were performed at lower temperature after magnetization either in a static field or in a pulse field. The trapped field is significantly higher at lower temperature. Cryocoolers become the key to compromise between performances and cryogenic cost around 40Â K.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica C: Superconductivity - Volume 469, Issues 15â20, 15 October 2009, Pages 1200-1206
Journal: Physica C: Superconductivity - Volume 469, Issues 15â20, 15 October 2009, Pages 1200-1206
نویسندگان
X. Chaud, J. Noudem, T. Prikhna, Y. Savchuk, E. Haanappel, P. Diko, C.P. Zhang,